Text line: .335, .373, .440
witness line: .210, .262, .188, .329, .439, .397
intersection: .393, .353, .285, .295, .319
a) use a 95% confidence interval to compare the mean zinc measurement for the text line with the mean for intersection.
b) use a 95% confidence interval to compare the mean zinc measurement for the witness line with the mean for intersection.
c) From results, part a and b, what can you infer about the mean zinc measurements at the three notebook location
d) What assumptions are required for the inference to be valid?